We're looking for a midlevel or senior IC to join our core engineering team. You'll be responsible for implementing and maintaining our C# client library, and also working alongside our core engineering team on the most performance-sensitive parts of our codebase. Responsibilities • Own and maintain our C# client library, ensuring it is robust, well-tested, and easy for external users to integrate with. • Design, develop, and maintain high-performance server applications in C++. • Write message parsers and feed handlers for direct market data feeds from trading venues. • Optimize existing codebase for high throughput (millions of messages per second, up to 40+ gigabits) and low latency (measured in nanoseconds). • Implement tools and libraries for petabyte-scale data processing and analysis. • Collaborate with the systems team to implement best practices for build, deployment, CI/CD. • Implement monitoring and improve application uptime. • Ensure smooth feature rollouts and updates. Preferred background • 5+ years of full-time software engineering experience, preferably at a trading firm, tech company, or high-growth startup. • Strong proficiency in both C++ and C#. • Experience with Java is a plus. • Experience designing APIs with a strong focus on intuitive, developer-friendly interfaces. • Familiarity with open source best practices, including release management, versioning, changelogs, issue triage, and backwards compatibility. • Knowledge of systems programming, algorithms, data structures, multithreading, networked I/O, serialization, CPU architecture, kernel, and compilers. • Experience working with multiprocess environments. • Comfortable with lldb/gdb. • Good communication skills and work ethic for a remote workplace. • An interest in low-level optimization and performance engineering. • An interest in financial data or algorithmic trading. Notice about phishing scams Be cautious of phishing scams impersonating Databento that offer fake job interviews and request purchases. Official emails come only from or us.greenhouse-mail.io (our ATS). Any other domains (e.g., databento-careers.com, databento.online) are fraudulent. Our recruiting data suggests that underrepresented applicants often downplay their skills. Even if your experience doesn't exactly match the qualifications listed, we still want to hear from you. Please apply!